Only check errno if getpwuid() fails
Only check errno if getpwuid() fails

Checking errno otherwise is unspecified.

edne/hidlock,mina86/slock,nshp/slock,schachmat/slock,oceans112/slock,chjj/slock,Miciah/slock-pam,wxg4net/slock,farseerfc/slock,MightyPork/slock,lotrfan/slock,dtkav/slock,oceans112/slock,guns/slock,MightyPork/slock,supki/slock,guns/slock,Duncaen/slock